How to remove duplicate image textures?
You can use the Remap Users function in Outliner.

Go to Outliner &gt; Blender File &gt; Images category.
Select images with the .001/.002... appendix.
RMB &gt; Remap users and choose the target image.

The remapped images will be removed on closing your .Blend.
(If they don't have a fake user assigned).